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. 2015 Apr;79(2):141–146.

Figure 1.

Figure 1

Transmission electron micrographs showing the expression of capsular polysaccharide (CPS) by the wild-type strain of Streptococcus suis serotype 14 and its derived mutants. The CPS was labelled with polycationic ferritin. The wild-type strain, DAN13730 (A), is surrounded by a thick capsule, whereas the Δcps14B and Δneu14C mutant strains (B and C, respectively) are non-encapsulated. The complemented strains Δcps14B/cps14B (D) and Δneu14C/neu14C (E) show an intermediate state of CPS production. Bars = 0.5 μm.